mxcl/homebrew — pull request #11565 by staticfloat (2012-04-10 20:12:22+00:00)
Title: brew tap --force

Add ability to "--force" when installing a tap, thus allowing for a "retap", in the event that formulae have been added/changed.

My use case: when I added the openblas and lapack formulae in my topic branch of homebrew-dupes, I had to retap staticfloat/dupes in order to get symlinks from the tap into `Library/Formula/`.